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  <title>test reference</title>
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    .control span {
      background: blue;
      color: blue;
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    .test span {
      background: orange;
      color: orange;
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    .ws-pre p {
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   <p>In each of the following pairs, the blue and orange bars must have equal lengths.</p>

   <!-- ZERO-WIDTH SPACE -->
   <div class="ws-normal">
     <p class="control"><span>A&#x200B;&#x200B;&#x200B;&#x200B;B</span></p>
     <p class="test"><span>A&#x200B;&#x200B;&#x200B;&#x200B;B</span></p>
   </div>
   <div class="ws-pre">
     <p class="control"><span>A&#x200B;&#x200B;&#x200B;&#x200B;B</span></p>
     <p class="test"><span>A&#x200B;&#x200B;&#x200B;&#x200B;B</span></p>
   </div>

   <!-- ZERO-WIDTH NO-BREAK SPACE -->
   <div class="ws-normal">
     <p class="control"><span>A&#xFEFF;&#xFEFF;&#xFEFF;&#xFEFF;B</span></p>
     <p class="test"><span>A&#xFEFF;&#xFEFF;&#xFEFF;&#xFEFF;B</span></p>
   </div>
   <div class="ws-pre">
     <p class="control"><span>A&#xFEFF;&#xFEFF;&#xFEFF;&#xFEFF;B</span></p>
     <p class="test"><span>A&#xFEFF;&#xFEFF;&#xFEFF;&#xFEFF;B</span></p>
   </div>

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   <div class="ws-normal">
     <p class="control"><span>A&#x200C;&#x200C;&#x200C;&#x200C;B</span></p>
     <p class="test"><span>A&#x200C;&#x200C;&#x200C;&#x200C;B</span></p>
   </div>
   <div class="ws-pre">
     <p class="control"><span>A&#x200C;&#x200C;&#x200C;&#x200C;B</span></p>
     <p class="test"><span>A&#x200C;&#x200C;&#x200C;&#x200C;B</span></p>
   </div>

   <!-- ZERO-WIDTH JOINER -->
   <div class="ws-normal">
     <p class="control"><span>A&#x200D;&#x200D;&#x200D;&#x200D;B</span></p>
     <p class="test"><span>A&#x200D;&#x200D;&#x200D;&#x200D;B</span></p>
   </div>
   <div class="ws-pre">
     <p class="control"><span>A&#x200D;&#x200D;&#x200D;&#x200D;B</span></p>
     <p class="test"><span>A&#x200D;&#x200D;&#x200D;&#x200D;B</span></p>
   </div>

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